Magneto-optical properties of nano-crystalline cubic and tetragonal copper ferrite thin films

Abstract

Copper ferrite, CuFe2O4, films can be stabilized in cubic or tetragonal phases depending on the deposition conditions and post-deposition heat treatment. The difference is explained by redistribution of cations over particular crystal sites and Jahn-Teller distortion of the spinel lattice. Comparative magneto-optical study of the copper ferrite thin films with cubic and tetragonal symmetry is presented. It is shown that the Faraday rotation and magnetic circular dichroism spectra represent a sensitive tool for examination of cation distribution of magnetic Cu2+ and Fe3+ ions in tetrahedral and octahedral crystal sites of the spinel lattice.

Evidence of a cubic iron sub-lattice in t-CuFe2O4 demonstrated by X-ray Absorption Fine Structure

“…When the bi-valent cations are located only in octahedral sites, the spinel is called ‘inverse’. Identifying with A and B the tetrahedral and octahedral sites respectively, the generic formula of a ferrite can be written as follows 23 : …”

Hollow Nanospheres Organized by Ultra-Small CuFe2O4/C Subunits with Efficient Photo-Fenton-like Performance for Antibiotic Degradation and Cr(VI) Reduction

“…In addition, there are numerous approaches that are effective methods to prepare copper ferrite, such as ball-milling, microwave and solvothermal methods [43][44][45][46][47][48][49]. Recently, most of the CuFe 2 O 4 reports have been widely studied in the photocatalysis field and have considered CuFe 2 O 4 as a superior candidate for wastewater due to its advantages, such as easy synthesis, inexpensive cost for production, good optical property, excellent catalytic activity and simple magnetic recoverability [50][51][52][53][54][55][56]. Therefore, in order to obtain photocatalysts with efficient performance, it is of great importance to develop convenient strategies for synthesizing various morphologies of CuFe 2 O 4 and CuFe 2 O 4 -based photocatalysts, such as hollow mesoporous CuFe 2 O 4 , core-shell CuFe 2 O 4 @C 3 N 4 , CuFe 2 O 4 @SiO 2 nanofibers and so on [57][58][59][60][61][62][63].…”

Tuning conductivity and magnetism of CuFe2O4via cation redistribution

“…10,13 The cation redistribution of copper ferrite leading to modulation of magnetic and magneto-optical properties have been well studied. 14,15 However, few attentions have been paid to the effect of cation redistribution on the electrical properties of copper ferrite, which still remains unclear. It is also important to understand the mechanism behind cation redistribution dependent electrical properties, which could extend the applications of spinel ferrite beyond permanent magnet, magnetic recording, power handling, and millimeter wave integrated circuitry applications.…”

“…15,17 Aer creating anti-site defect by transposing one Cu 2+ cation (T d site) with one Fe 3+ cation (O h site) in a 28-atom primitive unit cell, defect-like states emerge near the valence band maximum in CFO with l ¼ 0.75. Partial DOS indicates that these defect-like states are mainly attributed to the d orbitals of Cu (T d ) atoms and 2p orbitals of surrounding oxygen atoms, showing self-doping effect originating from transposition between Cu (O h ) atoms and Fe (T d ) atoms 25,26.…”